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Life / Eukarya / Opisthokonta / Animalia / Chordata / Vertebrata / Reptilia (incl. Aves)

Sphenodontia (tuatara)
Squamata (lizards, snakes)
Testudines (turtles)
Crocodylia (true crocodiles, alligators, caimans, gharials)
Aves (birds) (ostriches, penguins, eagles, pigeons, chicken etc.)
1. Lepidosauria
2. Archosauromorpha
3. Archosauria
References
Vertebrata